Journal
SCIENCE ADVANCES
Volume 6, Issue 7, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aay4092
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Funding
- National Nature Science Foundation of China [21773176, 21403157, 11874036]
- Fundamental Research Funds for the Central Universities [2042017kf0232, 2042019kf0200]
- New Faculty Startup Fund of Wuhan University, Large-scale Instrument and Equipment Sharing Foundation of Wuhan University
- U.S. Air Force Office of Scientific Research [FA9550-18-1-0072, FA9550-14-1-0268]
- National Key Research and Development Program of China [2017YFB0701600]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01N111]
- Shenzhen Projects for Basic Research [JCYJ20170412171430026]
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Intercalated transition metal dichalcogenides (TMDs) have attracted substantial interest due to their exciting electronic properties. Here, we report a unique approach where copper (Cu) atoms from bulk Cu solid intercalate spontaneously into van der Waals (vdW) gaps of group IV and V layered TMDs at room temperature and atmospheric pressure. This distinctive phenomenon is used to develop a strategy to synthesize Cu species-intercalated layered TMD compounds. A series of Cu-intercalated 2H-NbS2 compounds were obtained with homogeneous distribution of Cu intercalates in the form of monovalent Cu (I), occupying the tetrahedral sites coordinated by S atoms within the interlayer space of NbS2. The Fermi level of NbS2 shifts up because of the intercalation of Cu, resulting in the improvement of electrical conductivity in the z-direction. On the other hand, intercalation of Cu into vdW gaps of NbS2 systematically suppresses the superconducting transition temperature (T-c) and superconducting volume fraction.
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